Heartbeat + DRBD + NFS for high-availability file sharing

Heartbeat provides us with a low-cost, scalable, highly available cluster solution. We create a highly available (HA) clustered server under Linux via Heartbeat+drbd+nfs.

A DRBD is a block device that can be used in high availability (HA). It is similar to a network RAID-1 function. When you write data to the local file system, the data will also be sent to another host on the network. Recorded in a file system in the same form. Data from the local (primary) and remote host (standby node) can be synchronized in real time. When the local system fails, the remote host retains the same data and can continue to use it.

Two Case topology:

A Heratbeat Configuration

1. Modify the Hosts file

[Root@node1 ~]# vim/etc/hosts

127.0.0.1 localhost.localdomain localhost

:: 1 localhost6.localdomain6 Localhost6

192.168.10.1 node1.a.com

192.168.10.2 node2.a.com

2. Modify the Network file

[Root@node1 ~]# hostname node1.a.com

[Root@node1 ~]# Vim/etc/sysconfig/network

Networking=yes

Networking_ipv6=no

Hostname=localhost.localdomain

Nisdomain=node1.a.com

3. Configure the Yum source

[Root@node1 ~]# hwclock-s//Sync time

[Root@node1 ~]# Mkdir/mnt/cdrom

[Root@node1 ~]# Mount/dev/cdrom/mnt/cdrom

[Root@node1 ~]# Vim/etc/yum.repos.d/rhel-debuginfo.repo

[Rhel-server]

name=red Hat Enterprise Linux Server

Baseurl=file:///mnt/cdrom/server

Enabled=1

Gpgcheck=0

Gpgkey=file:///mnt/cdrom/rpm-gpg-key-redhat-release

[Rhel-cluster]

name=red Hat Enterprise Linux Cluster

Baseurl=file:///mnt/cdrom/cluster

Enabled=1

Gpgcheck=0

Gpgkey=file:///mnt/cdrom/rpm-gpg-key-redhat-release

The Node1 is the same as the Node2 configuration.

[Root@node1 ~]# Scp/etc/yum.repos.d/rhel-debuginfo.repo node2.a.com:/etc/yum.repos.d/

Heartbeat

4. The package required to install the heartbeat.

[Root@node1 ~]# yum Localinstall heartbeat-2.1.4-9.el5.i386.rpm heartbeat-lnoded-2.1.4-9.el5.i386.rpm  heartbeat-pils-2.1.4-10.el5.i386.rpm heartbeat-stonith-2.1.4-10.el5.i386.rpm libnet-1.1.4-3.el5.i386.rpm perl-mailtools-1.77-1.el5.noarch.rpm--nogpgcheck-y

[Root@node1 ~]# cd/usr/share/doc/heartbeat-2.1.4/

[Root@node1 heartbeat-2.1.4]# cp Authkeys haresources ha.cf/etc/ha.d/

[Root@node1 heartbeat-2.1.4]# Vim HA.CF

Bcast eth1//generating broadcast monitoring eth1

213 node node1.a.com//define Nodes

214 Node node2.a.com